Native to shady woodland habitats across the Southeastern United States, oakleaf hydrangeas are now a staple ornamental plant across USDA zones 5-9 in the temperate zone. Boasting large panicles bearing cone-shaped clusters of off-white blossoms, these hydrangeas are unlike most of their relatives, which typically flower in a dome-like shape. Numerous cultivars are available, so beyond shopping for the the distinctive leaf shape among the hydrangeas, look for the binomial name for the shrub: Hydrangea quercifolia . Both parts of this name say quite a lot about the plant. Hydrangea comes from...